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ST92195C 数据表(PDF) 17 Page - STMicroelectronics |
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ST92195C 数据表(HTML) 17 Page - STMicroelectronics |
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17 / 249 page  17/249 ST92195C/D - GENERAL DESCRIPTION PIN DESCRIPTION (Cont’d) AF Outputs or Bidirectional Lines: – In the case of Outputs or I/Os, AF is selected explicitly by software. Example 1: ADC trigger digital input AF: EXTRG, Port: P4.7, Port Style: Standard I/O. Write the port configuration bits (for TTL level): P4C2.7=1 P4C1.7=0 P4C0.7=1 Enable the ADC trigger by software as described in the ADC chapter. Example 2: PWM 0 output AF: PWM0, Port: P4.0 Write the port configuration bits (for output push- pull): P4C2.0=0 P4C1.0=1 P4C0.0=1 Example 3: ADC analog input AF: AIN1, Port : P2.1, Port style: does not apply to analog inputs Write the port configuration bits: P2C2.1=1 P2C1.1=1 P2C0.1=1 |
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